Tapering attachment for boring machines



Nov. 16, 1937. H. H. BAUER TAPERING ATTACHMENT FOR BORING MACHINES Filed Sept; 4, 1956 2 Sheets-Sheet l INVENTOR,

yadr d BY 4/? 4 4 ATTORNEY.

Nov 16, 1937. H. H. BAUER I 2,099,255

TAPERING ATTACHMENT FOR BORING MACHINES Filed Sept. 4, 1936 v 2 Sheets-Sheet 2 PA l0 INVENTOR/ i %W, fi

4 ATTORNEY.

Patented Nov. 16, 1937 UNITED S A E -i PATENT oFFicE TAPERING ATTACHMENT FOR BORING MACHINES Harold H. Bauer, Montgomery County, near Dayton, Ohio Application September 4, 1936, Serial No. 99,434.

8 Claims.

This invention relates to new and useful improvements in a Tapering attachment for boring machines. i I

It is one of the principal objects of my invention to provide a compact and efiicient taperboring chuck that may be'easily attached to any boring mill, jig-borer, or the like."

My taper-boring chuck makes it possible to apply the taper-boring device to the rotating tool of a boring machine, whereas at present it is necessary'to do all taper boring in a lathe where the work rotates, or by the use of taper reamers.

The'hole bored by my taper-boring chuck will be smooth and straight, and at the exact angle at which'the taper-control bar is set.

. Itis a'further object of my invention to provide special cam bars for substitution for the straight taper cam bar in mytaperboring chuck, to bore holes of special contours, such as the 0 holes of uneven longitudinal contours in moulds In the accompanying drawings illustrating various forms of embodiment of my invention, Fig-' ure 1 is a horizontal, perspective view showing my taper-boring apparatus attached to a boring mill. Figure 2 is a vertical, perspective view of my taper-boring apparatus attached to a jigborer. Figure 3 is a vertical, sectional view taken through my taper-boring chuck and attachment for controlling the taper. Figure 4 is a vertical, sectional viewtaken through the same at right angles to the plane of the section through Figurl3,

Figure 5 is a bottom plan view thereof. Figure 6 is a cut-away enlarged, vertical sectional view taken through the taper boring mechanism. Figure 7 is a vertical, sectional View taken through aimodified form of my taper-boring mechanism, in which a straight cam bar is replaced with a special bar ofpredetermined contour. And Figure 8 is a'verticaL'sectional view taken through a piece of metalcontaining a hole bored by my taper-boring chuck employing the special cam bar illustrated in Figure 7. I

Referring to the accompanying drawings for a detailed description of the various forms of cm- 5'0; bodiment of my invention illustrated therein, the

numeral 1 infFigure 1 designates a boring mill to the spindle 2 of which my taper-boring chuck 3 is attached. In Figure 2 the taper-boring chuck 3 is shown attached to the spindle 4 of a jig-borer 5.

I Mytapera-boring chuck 3 preferably comprises an accurately ground shell or body 6 having an open internally threaded top into which a cap l is threaded and locked in place by two set screws 8 to insure solidity and concentric rotation of the body. This cap, due to its threaded fit, permits of proper adjustment to prevent any looseness of the primary tool head section 9. The top of the cap 1 contains an internally threaded recess H) to receive the threaded lower end ll of a shank [2 which is fitted into the spindle of the machine; In Figure 1 it is shown fitted into the spindle 2 of a boring mill l, whereas in Figure 2 it is attached to the spindle 4 of a jig-borer 5.

The primary tool head section 9, which is radially or transversely slidable in the shell or body 5, carries an adjustable sine-bar or cam bar l3 that is pivotally secured to a boss 14 on the inner end thereof by a pin I5. The outer end of the primary tool head section 9 is formed with a lateral threaded hole containing the shank of an adjusting screw l6 whose head ll is fitted ina recess IS in the free end of the cam bar. (See Figures 3 and 6).

The cam bar I3 is maintained in contact with the head of the adjusting screw it by a draw rod l9 connected at its outer end to a pin 20 within a recess 2| in its upper middle portion. The draw rod l9 passes through a lateral hole 22 in the primary tool head section 9, into a counterbore 23 in the latter, and through said counterbore into an enlarged recess 24 in said olfset. A compression spring 25 surrounds the draw rod l9 be tween the inner end of the counterbore 23 and a retaining washer 26 carried by the inner end of said'rod. This spring exerts an inward pressure upon the rod 19 to cause it to draw the cam bar l3-into engagement with the head of the adjusting screw [6.

For the purpose of boring straight holes I pro vide an auxiliary stop screw 21 in the primary tool head section 9, for engagement by the cam bar l3 to hold it parallel with the axis of the chuck when the adjusting screw 56 has attained its maximum inward movement.

The primary tool head section 9 projects through a slot 28 in 'the bottom of the body 6 for guidance during its transverse or lateral movement. (See Figures 3 and 5).

Fitted in the lower end of the primary tool head section 9 is a secondary tool head section 29 that is made adjustable therein by a micrometric screw 30. The primary tool head section 9 and the secondary tool head section 29 are formed with complementary semi-cylindrical, threaded recesses which receive the screw 30. A tongue 3i is provided on the primary tool head section for entrance into an annular groove in the screw, whereby, when the screw is turned, the secondary tool headsection will be moved laterally inde pendent of the primary tool head section.

The secondary tool head section 29 is provided in its bottom portion with a recess 32 to receive a boring tool or. bar 33. which. is. securely fastened therein by alockscrew 34. (See Figures 1' and 6.) may also be locked in position Within the primary. tool head section 9 by a lock screw 35 operable through a slot 36 in the chucklbody'ti.

Transverse movement of the primary tool head? section 9 is effected by the pressure exerted upon it by a ring 37 carried by an annular thrust bear;- ing 38 mounted in a flanged supporting ring 39. The latter is secured by screws: 4fiito-theaoutera ends of supporting arms 4|, 4| whose inner ends. are attached by screws 42 to the jig borer head 43 shownin Figure -2, andit'otheflangering ll on the spindle'quill 4510f the 'boring mill l illus trated in Figure-1.

When during theboring operation the chuck.

body 6 moves downwardly; throughl'the ringgfl; the latter will engagethe cam bar: hand-move itinwardly. The. inwardly moving, cam bar will then, through the: screw l6,=.presswinwardly thee primary tool headsectionlil; to which thesecondary tool head-section: 29', carrying the boringgtool 23, is attached. Therefore, when. theboring'tool; is rotatedby; the spindle z'inthe: boring mill in Figurel, or by the spindle 4 --in.-the--jigborer 5 in Figure:2, it will; borea. hole: of. theidesired straight taper'inthe Workabeing operated upon.. The desired taper: ofthe 1101621101 be'bored'isobtained by. an adjustmentrof the screwl Gzbefore= the boring operatiorris started. The'head -of-5thisscrew is. engagedby the :free. end:of zthecam bar l3; to move the primary; tool head section 9 in? .wardly when. the said-cam bar'is engagedaby the draw ring 31: as: the. chuck body- 5: is; forced through it by the spindle.

The secondary tool headsection ZB- may-be adjusted by the micrometricscrew: 30- toz predetermine the diameter of :the hole-to'bebored.

A compression spring.SZ-isinsertedtbetvveen the,- primary offset and th'e interior; surface 1 of the; shell diametrically; oppositethe-cambart l3, to: maintain constant contactibetween:the'lattenandi the ring 31. (SeeFig-ure:3.-);

In Figure? Iihave-illustrateda modified .form; of cam bar for my tapereboring; chuck. In this instance the adjustable cam. bar: l3is:made-.in two parts, the inner part 46;being;;hingedlwconnectedI to-the primary-tool: head section-:9 for engage.- ment at its upper end with-.the headof' thead justing screw I6. Secured to the'inn'eropart lfi; of this cam. bar. by fastening:- meanssuch: as screws- 41 and dowel-pins-48-is arnouterpart .49. The latter part is. formed: in a! shape designed: to effect the boringgof arholeof a; specialtcontours in a metal piece. Such: a hole 5.0' is illustrated as having been bored-in thepiece' 5| illustratedin Figure 8. While the contour of thishole; is concentric withi'its taxis; it is uneven; longitudie r nally, as is often themaseywith h01SFiIl1IIIDllldS3 for glassware, bakeliteiandlthezlikes. Such holes:

can be bored only when my taper boring, chuck employing the two-partxcami bar iszused, since the ring 3'! will follow'theeunevenacontourr'ofzthe' outer partof the cam .bar' to 'impartzthe'proper lateral movement to' the..primary= tool theadtsection 9 to positionuthe boring:tool atzzthe angles required to'bore a hole of the desireduneven:

The secondary tool head section 29' longitudinal contour. At present such holes can only be bored by the use of a templet on a lathe,

which requires considerable time and labor.

The outer part 49 of the two-piece cam bar 'may be easily replaced by a'straight bar to efiect 5 end tothe shell for contact with said ring through which it is forced by the spindle, and anadjustableconnection between the free end of the cam bar and the tool head whereby, when the'freeend of said bar is forced inwardly by the 7 ring .while the 1 shell apassestherethrough; the tool head carrying the; boring tool, wi'lhbeemovedt inwardly by said adjustable connectiomto pro duce a-taperedhole. I

2. A boring apparatus-having. a jig-,borer" head; 25, a. frame projecting; axially from: said-head; a; spindle rotatably and longitudinall n movablez-in; said. frame, a shellxseoured to said. spindle; a-.-too1 head transversely movable in saidshell; ell-boring;- tool: carried by said toot-head; a ring; supported: by the frame and held-against movementtaxiallyof the spindle, a cam'bar. pivotally secured atone endto the shell. for contact with saidiring through which it is forced" by the, spindle,. and; an adjustable member carried by,- the tool head: andprojecting beyond the-clatter for'engagement by the free end of the cam-bar, whereby; when: the free end of said bar. is forcedinwardly byther ring while the shell passes, therethro-ugh, the. tool head marryingthe ;boring ;,to ol-will-beemoved inwardly by said;adjustabl& member? torproduce: a tapered-hole.

3. A boring? apparatus 'havingaijigvborerhead a frame.- projecting: axially from .said head;, a: spindle rotatably andelong-itudinally; movab1e.-in said frame, a shell securedtotsaid-spindle,,a2tool1 head transversely movable insaid :shell; apboring tool carried by-said1tool;head; a=ringrsupportedz by. said i frame and held. against movement axiallyy of.- the spindle; a camber: pivotally secured at: onesendto the shell foncontact with-saidring; through which itisforcedv by: the; spindlaxam adjustable member carried by the toolfheadand'i projecting beyondthe'latter for: engagement: by; the free end-of the cam bar", andiresilientimeansi 55 also carried by the tool head and attached totthe: cam bar to. draw'it: into.-engag.ement.with.zthe outer endof the, adjustable member, therfree end ofisaid: camvbar', when presseda. inwardlyrby; the-ring; adapted to forcerthe adjustablamember: 60:, and through it @the tool. head carrying therboring z. tool inwardly to produce a tapered'holes.

4, A boring apparatus having .asjigrborer:head;1. a frame projecting axially from {said head, ,a'

spindle rotatably and longitudinally-r movable;- in w,

by the tool head and secured at one end to the cam bar, and a compression spring on said rod for drawing it, and the free end of the cam bar inwardly, to maintain the latter in contact with the adjustable member whereby, when the free end of said cam bar is forced inwardly by the ring while the shell passes therethrough, the tool head carrying the boring tool will be moved inwardly by the adjustable member to produce a tapered hole.

5. A boring apparatus having a jig borer head, supporting arms attached and projecting axially from said head, a spindle rotatably and longitudinally movable within the space defined by said arms, a shell secured to said spindle, a boring tool carried by said tool head, a supporting ring secured to the outer ends of said arms, a ring supported by said first ring through which the shell is forced by the spindle, the second ring being held by the first ring against movement axially of the spindle, a cam bar pivotally secured at one end to the shell for contact with the second ring through which it is forced by the spindle, and a connection between the free end of the cam bar and the tool head whereby, when the free end of the cam bar is forced inwardly by the second ring while the shell passes therethrough, the 'tool head carrying the boring tool will be moved inwardly by said connection to produce a tapered hole.

6. A boring apparatus having a jig borer head, a frame projecting axially from said head, a spindle rotatably and longitudinally movable in said frame, a shell secured'to said spindle, a tool head transversely movable in said shell, a boring tool carried by said tool head, a ring supported by said frame and held against movement axially of the spindle, a cam bar pivotally secured at one end to the shell for contact with said ring through which it is forced by the spindle, an

adjustable screw carried by the tool head and projecting beyond the latter for engagement by the free end of the cam bar, and a stop also carried by the tool head to engage the cam bar and hold it parallel with the axis of the shell when said adjusting screw has attained its maximum inward movement, the tool head carrying the boring tool adapted to be moved inwardly by the adjustable screw to produce a tapered hole when the free end of said bar is forced inwardly by the ring while the shell passes therethrough. '7. A boring apparatus having a jig borer head, a frame projecting axially from said head, a spindle rotatably and longitudinally movable in said frame, a shell secured to said spindle, a tool head transversely movable in said shell, a boring tool carried by said tool head, a ring supported by the frame and held against movement axially of the spindle, a cam bar pivotally secured at one end to the shell for contact with said ring through which it is forced by the spindle, an adjustable member carried by the tool head and projecting beyond the latter for engagement by the free end of the cam bar, and resilient means carried by the tool head and attached to the cam bar to draw it into engagement with the outer end of the adjustable member, and means having an outer curved surface attached to the cam bar whereby, when said surface is engaged by the ring, the tool head will be moved by the adjustable member to produce a hole of special contour that is predetermined by the shape of said outer surface of the last said means.

8. A boring apparatus having a jig borer head, a frame projecting axially from said head, a spindle rotatably and longitudinally movable in said frame, a shell secured to said spindle, a tool head transversely movable in said shell, a boring tool carried by said tool head, a ring supported by the frame and held against movement axially of the spindle, a cambar pivotally secured at one end to the shell for contact with said ring through which it is forced by the spindle, an adjustable member carried by the tool head and projecting beyond the latter for engagement by the free end of the cam bar, resilient means carried by the tool head and attached to the cam bar to draw it into engagement with the outer end of the adjustable member, and a member having an outer curved surface removably attached to the cam bar, whereby, when said surface is engaged by the ring, thetool head will be moved by the adjustable member to produce a hole of special contour that is predetermined by the shape of said outer surface of the removable member.

HAROLD I-I. BAUER. 

